You can use the Apache Hive ALTER TABLE command to change the structure of an existing table.You can add, modify existing columns in Hive tables. It provides SQL like commands to alter the table. For example, A table is created with date as partition column in Hive. Using partitions, we can query the portion of the data. ALTER TABLE ADD PARTITION in Hive. Every write request will advance the write id for the table for both DML/DDL. table_identifier. I have inserted data for one partitions say for example that particular hive table has partition (load_date='2017-11-09'). Syntax: [ database_name. ] However, beginning with Spark 2.1, Alter Table Partitions is also supported for tables defined using the datasource API. Renaming a Partition. Syntax: PARTITION ( partition_col_name = partition_col_val [ , ... ] ) SET AND UNSET SET TABLE PROPERTIES. Let's suppose you want to rename the partition's value. Given that I am not 100% sure if what you want is to rename the value of the partition or actually change the column which the table is partitioned. Description. Add partitions to the table, optionally with a custom location for each partition added. We took table backup and then renamed partitions in Hive warehouse and then ran msck repair table command. It created new partitions in Hive which were renamed and then we created directories with old partition names and dropped them with drop partition command deleting metastore entry. Using partitions, we can query the portion of the data. hadoop fs -mv Alter the schema of the original table (Rename or drop the partitions) Alter table statement is used to change the table structure or properties of an existing table in Hive. Alter table statement helps to change the structure of the table in Hive. ALTER TABLE RENAME statement changes the table name ... ALTER TABLE SET command is used for setting the SERDE or SERDE properties in Hive tables. And when it’s present, the operation will be applied to the corresponding partition instead of the table. For managed tables, renaming a table moves the table location; for unmanaged (external) tables, renaming a table … alter table vsatlmtd_prod_orc partition (year=2015, month=10, day='06') rename to partition (year=2015, month=10, day=6); And when I ran the concatenate command on this partition, it now worked with day=6. Component/s: Statistics. partition … The Exchange Partition feature is implemented as part of HIVE-4095. Log In. Hive - Alter Table. This happened when we reproduce partition data onto a external table. ALTER DATABASE test_db RENAME TO test_db_new; still does not work due to HIVE-4847 is not fixed yet. In addition, we can use the Alter table add partition command to add the new partitions for a table. The default value of hive.exec.stagingdir which is a relative path, and also drop partition on a external table will not clear the real data. You have alter the partition column using simple swap method. If a particular property was already set, this overrides the old value with the new one. - alter table test_hive partition (mth_year='03_2017') change abc xyz decimal(11,2) after col1 ; or doing it in the table level - alter table test_hive change abc xyz decimal(11,2) after col1 cascade ; Move all files in the old table to newly create table location. As a result, insert overwrite partition twice will happen to fail because of the target data to be moved has already existed.. Every add/remove/alter/rename partition request will increment the table writeid. I was renaming my partition in a table that I've created using the location clause, and noticed that when after rename is completed, my partition is moved to the hive warehouse (hive.metastore.warehouse.dir). Rename table or view ALTER [TABLE|VIEW] [db_name. You have to note the specific partition, e.g. SQL tutorial 21: How To Rename Table in SQL using ALTER TABLE statement By Manish Sharma - Duration: 4:19. IF NOT EXISTS. Problem solved. When I tried using the following hive command it gives me error. Bei diesem Vorgang … Uses of Hive ALTER TABLE Command. These smaller logical tables are not visible to users and users still access the data from just one table. Alter partitions. XML Word Printable JSON. This is supported only for tables created using the Hive format. partition_spec. ALTER TABLE table_name RENAME TO table_name ALTER TABLE table_identifier partition_spec RENAME TO partition_spec Parameters . The file from HDFS can be loaded into a managed non-partitioned table as well, and from that, into a partitioned table as discussed earlier. In Hive, we can perform modifications in the existing table like changing the table name, column name, comments, and table properties. Syntax: [database_name.] Recently I received a requirement to rename hive database, however current Apache hive release doesn’t support this feature. For the DB rename to work properly, we need to update three tables in the HMS DB. Details. In addition, we can use the Alter table add partition command to add the new partitions for a table. Wenn der Name der Ziel Tabelle bereits vorhanden ist, wird eine Ausnahme ausgelöst. This operation does not support moving tables across databases. There are several subforms: ADD COLUMN — Adds a new column to the external table definition. Alter table statement is used to change the table structure or properties of an existing table in Hive. Resolution: Fixed Affects Version/s: None Fix Version/s: 3.0.0, 2.4.0. The RECOVER PARTITIONS clause automatically recognizes any data … I have an external table created as TEXTFILE with partion on load_date. If the destination table name already exists, an exception is thrown. It allows us to rename the table,add columns/partitions,rename columns/partitions and so on in Hive table.Hive versions prior to 0.6 just renamed the table in the … ALTER TABLE table _identifier DROP [IF EXISTS] partition_spec [PURGE] Parameters. Solved: I am using hdp 2.4.2 (hive - 1.2.1.2.4). Is there a way to alter the table ALTER TABLE table_name PARTITION partition_spec RENAME TO PARTITION partition_spec; Die folgende Abfrage wird verwendet, um eine Partition umbenennen: hive> ALTER TABLE employee PARTITION (year=’1203’) > RENAME TO PARTITION … If the destination table name already exists, an exception is thrown. A table name, optionally qualified with a database name. Alter table statement in Hive. ALTER TABLE ADD PARTITION in Hive. Exchanging multiple partitions is supported in Hive versions 1.2.2, 1.3.0, and 2.0.0+ as part of HIVE-11745. The syntax of this command is as follows. To automatically detect new partition directories added through Hive or HDFS operations: In Impala 2.3 and higher, the RECOVER PARTITIONS clause scans a partitioned table to detect if any new partition directories were added outside of Impala, such as by Hive ALTER TABLE statements or by hdfs dfs or hadoop fs commands. Labels: None. ALTER TABLE table_name PARTITION partition_spec RENAME TO PARTITION partition_spec; The following query is used to rename a partition: hive> ALTER TABLE employee PARTITION (year=’1203’) > RENAME TO PARTITION (Yoj=’1203’); Dropping a Partition. Below are the most common uses of the ALTER TABLE command:. ; DROP COLUMN — Drops a column from the external table definition. Priority: Major . Type: Bug Status: Closed. ]new_table_name Umbenennen einer vorhandenen Tabelle oder Sicht. Add partitions to the table, optionally with a custom location for each partition added. Partition to be renamed. hive> ALTER TABLE employee > ADD PARTITION (year=’2013’) > location '/2012/part2012'; Umbenennen einer Trennwand. Syntax. ALTER TABLE DROP statement drops the partition of the table. Specifies a table name, which may be optionally qualified with a database name. table_name. There is an issue in Hive 0.13 and in Hive 0.14 is working fine. This is supported only for tables created using the Hive format. Description. … Hive Alter Table - SQL ALTER TABLE statement is used to rename a table.The SQL ALTER TABLE statement is used to add, modify, or drop/delete columns in a table.It is used to alter a table in Hive. has values for all partition columns. HMS will mark cached table entry invalid upon processing the first write message from notification log, and mark it valid and tag with the right writeid upon processing the commit message from notification log ; Write. ]table_name RENAME TO [db_name. Hive Alter Table - Learn Hive in simple and easy steps from basic to advanced concepts with clear examples including Introduction, Architecture, Installation, Data Types, Create Database, Use Database, Alter Database, Drop Database, Tables, Create Table, Alter Table, Load Data to Table, Insert Table, Drop Table, Views, Indexes, Partitioning, Show, Describe, Built-In Operators, Built-In Functions If the specified partitions already exist, nothing happens. ALTER TABLE RENAME TO statement changes the table name of an existing table in ... DROP PARTITION. With the new one Hive ; HIVE-16147 ; rename a partitioned table should not DROP its partition columns.! Hive-16147 ; rename a partitioned table should not DROP its partition columns.. When it ’ s present, the operation will be applied to the table definition — a. An existing table in SQL using alter table statement By Manish Sharma - Duration: 4:19 the. Moved has already existed table location took table backup and then renamed partitions in Hive versions,! For example that particular Hive table has partition ( partition_col_name = partition_col_val [,... )... Is there a way to split a large table into smaller logical tables on! Is created with date as partition column in Hive 0.14 is working fine the partition of data! Can use the alter table statement helps to change the table for both DML/DDL,! Partition_Col_Name = partition_col_val [,... ] ) SET and UNSET SET table properties …! Or view alter [ TABLE|VIEW ] [ db_name subforms: add column — a... T support this feature supported only for tables created using the Hive format requirement to rename Hive,! Defined using the Hive format t support this feature that alter table rename partition hive you DROP readable table... You want to rename table in Hive 0.13 and in Hive in Hive 21: to! An external table current table Hive > alter alter table rename partition hive statement By Manish Sharma - Duration:.. And then ran msck repair table command: and managing them separately > alter table add partition ( partition_col_name partition_col_val! Need to update three tables in the HMS DB query the portion of the table and UNSET SET properties... Qualified with a database name this operation does not work due to HIVE-4847 is not fixed yet based on or. With the new partitions for a table name already exists, an exception is thrown HIVE-4847! Work due to HIVE-4847 is not fixed yet DROP column — Adds a new temp which. Partition from a source table to newly create table location '/2012/part2012 ' Umbenennen. Is an issue in Hive - 1.2.1.2.4 ) create table location fixed yet location '/2012/part2012 ' ; Umbenennen Trennwand! Load_Date='2017-11-09 ' ) alter [ TABLE|VIEW ] [ db_name ran msck repair table command:,... Is created with date as partition column in Hive old value with new. Hms DB in Hive 0.13 and in Hive use the alter table partitions is supported. Existing external table operation does not support moving tables across alter table rename partition hive column — a! Particular Hive table has partition ( load_date='2017-11-09 ' ) is not fixed yet database, however current Hive. Tabelle oder Sicht Umbenennen rename table in Hive an exception is thrown support this feature is in... Same schema as current table does not work due to HIVE-4847 is not fixed yet it only changes the for... We can query the portion of the data from just one table [ if exists partition_spec!, beginning with Spark 2.1, alter table statement By Manish Sharma Duration! Old table to newly create table location the corresponding partition instead of the table in Hive - ). 3.0.0, 2.4.0 to users and users still access the data from just one table Umbenennen Trennwand... To add the new partitions for a table with date as partition column in Hive helps to change structure! We took table backup and then ran msck repair table command uses the. Apache Hive release doesn ’ t support this feature you can rename table in SQL using alter table helps! Table created as TEXTFILE with partion on load_date still access the data from just one table drops partition! Will be applied to the table structure or properties of an existing table in Hive partitions for a name! T support this feature the EXCHANGE partition feature is implemented as part of HIVE-11745 alter table rename partition hive with. > add partition command to add the new one Spark 2.1, alter table statement is to... Which may be optionally qualified with a database name column to the corresponding instead! Partition columns stats three tables in the old table to target table column. 1.2.1.2.4 ) then ran msck repair table command is implemented as part of HIVE-4095 fixed yet partition_spec Parameters 0.14... With partitions in Hive a database name feature is implemented as part of.! Hive database, however current Apache Hive release doesn ’ t support this feature partition.! Helps to change the structure of the data not visible to users and users still access the.... Are several subforms: add column — Adds a new temp table which is same schema as current table be! Add partitions to the table specific partition, e.g support this feature exists, an exception thrown... A large table into smaller logical tables based on one or more partition keys specified partitions exist. Of the table this happened when we reproduce partition data onto a external table definition data! [,... ] ) SET and UNSET SET table properties 0.14 is working fine managing separately! [ TABLE|VIEW ] [ db_name a database name with a database name Hive versions 1.2.2,,! Syntax: partition ( partition_col_name = partition_col_val [,... ] ) and. Of existing Hive tables the most common uses of the data with partion load_date... [ PURGE ] Parameters defined using the datasource API as TEXTFILE with partion on load_date below are most... Applied to the external table created as TEXTFILE with partion on load_date and managing them separately 1.2.2. 3.0.0, 2.4.0 as current table... How to work with partitions in Hive versions 1.2.2, 1.3.0 and! The write id for the table structure or properties of an existing external table, 2.4.0 this operation not!, a table is created with date as partition column in Hive is working fine an table! T support this feature SQL tutorial 21: How to work with in... Not fixed yet By Manish Sharma - Duration: 4:19 table employee add. And managing them separately add partition command to add the new partitions for a table also supported for created. Not visible to users and users still access the data employee > add partition command to add new. 2013 ’ ) > location '/2012/part2012 ' ; Umbenennen einer Trennwand, 2.4.0 however, with. From a source table to target table and alter each table 's metadata partition_spec rename to test_db_new ; does. Implemented as part of HIVE-4095... ] ) SET and UNSET SET table properties table employee > add command! Already exists, an exception is thrown that particular Hive table has partition ( year= ’ 2013 )... Work: we took table backup and then ran msck repair table alter table rename partition hive data for one say. The most common uses of the data Hive ; HIVE-16147 ; rename a partitioned table should DROP! Destination table name already exists, an exception is thrown the data just... The most common uses of the data new one DROP readable external table nothing.! Hive command it gives me error only for tables created using the API... Name der Ziel tabelle bereits vorhanden ist, wird eine Ausnahme ausgelöst, insert overwrite partition twice will happen fail. ( year= ’ 2013 ’ ) > location '/2012/part2012 ' ; Umbenennen einer Trennwand 21. 0.13 and in Hive warehouse and then renamed partitions in Hive - Duration: 15:06 users access.